<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert show-icon title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false">
			</el-alert>

			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>

					<!-- 选择商品分类的级联选择框 -->
					<el-cascader change-on-select clearable expand-trigger="hover" v-model="selectedCateKeys"
						:options="catelist" :props="cateProps" @change="handleChange"></el-cascader>

				</el-col>
			</el-row>

			<!-- tab 页签区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染tag 标签 -->
								<el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
									{{item}}
								</el-tag>
								<!-- 输入文本框 -->
								<el-input
								  class="input-new-tag"
								  v-if="scope.row.inputVisible"
								  v-model="scope.row.inputValue"
								  ref="saveTagInput"
								  size="small"
								  @keyup.enter.native="handleInputConfirm(scope.row)"
								  @blur="handleInputConfirm(scope.row)">
								</el-input>
								<!--添加的按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
						<!-- 静态属性表格 -->
						<el-table :data="onlyTableData" border stripe>
							<!-- 展开行 -->
							<el-table-column type="expand">
								<template slot-scope="scope">
									<!-- 循环渲染tag 标签 -->
									<el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
										{{item}}
									</el-tag>
									<!-- 输入文本框 -->
									<el-input
									  class="input-new-tag"
									  v-if="scope.row.inputVisible"
									  v-model="scope.row.inputValue"
									  ref="saveTagInput"
									  size="small"
									  @keyup.enter.native="handleInputConfirm(scope.row)"
									  @blur="handleInputConfirm(scope.row)">
									</el-input>
									<!--添加的按钮 -->
									<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							
								</template>
							</el-table-column>
							<!-- 索引列 -->
							<el-table-column type="index"></el-table-column>
							<el-table-column label="属性名称" prop="attr_name"></el-table-column>
							<el-table-column label="操作">
								<template slot-scope="scope">
									<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
									<el-button size="mini" type="danger" icon="el-icon-delete"@click="removeParams(scope.row.attr_id)">删除</el-button>
								</template>
							</el-table-column>
						</el-table>
					</el-tab-pane>
				</el-tab-pane>
			</el-tabs>

		</el-card>
         
		 <!-- 添加参数的对话框 -->
		 <el-dialog
		   :title="'添加'+titleText"
		   :visible.sync="addDialogVisible"
		   width="50%" @close="addDialogClosed">
		  <!--添加参数的对话框 -->
		  <el-form ref="addFormRef" :rules="addFormRules" :model="addForm" label-width="100px">
		    <el-form-item :label="titleText" prop="attr_name">
		      <el-input v-model="addForm.attr_name"></el-input>
		    </el-form-item>
			</el-form>
		  
		   <span slot="footer" class="dialog-footer">
		     <el-button @click="addDialogVisible = false">取 消</el-button>
		     <el-button type="primary" @click="addParams">确 定</el-button>
		   </span>
		 </el-dialog>
		 
		 <!-- 修改参数对话框 -->
		 <el-dialog
		   :title="'修改'+titleText"
		   :visible.sync="editDialogVisible"
		   width="50%" @close="editDialogClosed">
		  <!--添加参数的对话框 -->
		  <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="100px">
		    <el-form-item :label="titleText" prop="attr_name">
		      <el-input v-model="editForm.attr_name"></el-input>
		    </el-form-item>
		 			</el-form>
		  
		   <span slot="footer" class="dialog-footer">
		     <el-button @click="editDialogVisible = false">取 消</el-button>
		     <el-button type="primary" @click="editParams">确 定</el-button>
		   </span>
		 </el-dialog>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				// 商品分类列表
				catelist: [],
				// 级联选择框的配置对像
				cateProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				// 级联选择框双向绑定的数组
				selectedCateKeys: [],
				// 被激活的页签的名称
				activeName: 'many',
				// 动态参数的数据
				manyTableData: [],
				// 静态参数的数据
				onlyTableData: [],
				// 控制添加对话框的显示与隐藏
				addDialogVisible:false,
				// 添加参数的表单数据对象
                 addForm:{
					 attr_name:''
				 },
		        //添加表单的验证规则对象
				addFormRules:{
					attr_name:[{
						required:true,message:'请输入参数名称',trigger:'blur'
					}]
				},
				// 控制修改对话框的显示与隐藏
				editDialogVisible:false,
				// 修改的表单数据对象
				editForm:{},
				// 修改表单的验证规则对象
				editFormRules:{
					attr_name:[{
						required:true,message:'请输入参数名称',trigger:'blur'
					}]
				}		
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			// 获取所有的商品分类列表
			async getCateList() {
				const {
					data: res
				} = await this.$http.get('categories')
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品分类是失败！')
				}
				this.catelist = res.data
				console.log(res.data)
			},
			// 级联选择框选中变化，会触发这个函数
			handleChange() {
				this.getParamsData()
			},
			// tab 页签点击事件的处理函数
			handleTabClick() {
				console.log(this.activeName)
				this.getParamsData()
			},
			//获取参数列表的数据
			async getParamsData() {
				// console.log(this.selectedCateKeys)
				//证明选中的不是三级分类
				if (this.selectedCateKeys.length !== 3) {
					this.selectedCateKeys = []
					this.manyTableData=[]
					this.onlyTableData=[]
					return
				}
				// 证明选中的是三级分类
				console.log(this.selectedCateKeys)
				// 根据所选的Id，和当前所处的面板，获取对应的参数
				const {
					data: res
				} = await this.$http.get(`categories/${this.cateId}/attributes`, {
					params: {
						sel: this.activeName
					}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取参数列表失败！')
				}
				//console.log(res.data)
				
				res.data.forEach(item=>{
				item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : [],
				// 控制文本框的显示与隐藏
				item.inputVisible=false
				// 文本框中输入的值
				item.inputValue=''
				})
				console.log(res.data)
				
				if (this.activeName === 'many') {
					this.manyTableData = res.data
				} else {
					this.onlyTableData = res.data
				}
			},
			// 监听对话框的关闭事件
			addDialogClosed(){
				this.$refs.addFormRef.resetFields()
			},
			//点击按钮，添加参数
			addParams(){
				this.$refs.addFormRef.validate( async valit=>{
					if(!valit) return
				const {data:res}=await	this.$http.post(`categories/${this.cateId}/attributes`,{
						attr_name:this.addForm.attr_name,
						attr_sel:this.activeName
					})
					if(res.meta.status!==201){
						return this.$message.error('添加参数失败！')
					}
					this.$message.success('添加参数成功！')
					this.addDialogVisible=false
					this.getParamsData()
				})
			},
			// 点击按钮，展示修改对话框
		    async showEditDialog(attr_id){
				// 查询当前参数的信息
			const {data:res}=await	this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
					params:{attr_sel:this.activeName}
				})
				if(res.meta.status!==200){
					return this.$message.error('获取参数信息失败！')
				}
				this.editForm=res.data
				this.editDialogVisible=true
			},
			// 重置修改的表单
			editDialogClosed(){
				this.$refs.editFormRef.resetFields()
			},
			// 点击按钮修改参数信息
			editParams(){
			this.$refs.editFormRef.validate(async valid=>{
				if(!valid) return
			const {data:res}=await	this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
					attr_name:this.editForm.attr_name,
					attr_sel:this.activeName
				})
				if(res.meta.status!==200){
					return this.$message.error('修改参数失败！')
				}
				this.$message.success('修改参数成功！')
				this.getParamsData()
				this.editDialogVisible=false
			})
			},
			// 根据id删除对应的参数项
			async removeParams(attr_id){
				const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
				          confirmButtonText: '确定',
				          cancelButtonText: '取消',
				          type: 'warning'
				        }).catch(err=>err)
						//用户取消了删除操作
						if(confirmResult !=='confirm'){
							return this.$message.info('已取消删除！')
						}
						
						// 删除的业务逻辑
					const {data:res}=await	this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
					if(res.meta.status!==200){
						return this.$message.error('删除失败！')
					}
					this.$message.success('删除成功！')
					this.getParamsData()
			},
			// 文本框失去焦点，或摁下了enter键都会触发
		async	handleInputConfirm(row){
				//console.log('ok')
				if(row.inputValue.trim().length===0){
					row.inputValue=''
					row.inputVisible=false
					return
				}
                   // 如果没有return ，则说明输入的内容，需要做后续的处理
				   row.attr_vals.push(row.inputValue.trim())
				   row.inputValue=''
				   row.inputVisible=false
				   //需要发起请求，保存这次操作
				  this.saveAttrVals(row)  
			},
			//将对attr_vals 的操作，保存到数据库 
			async saveAttrVals(row){
				//需要发起请求，保存这次操作
				const {data: res}=await   this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
					   attr_name:row.attr_name,
					   attr_sel:row.attr_sel,
					   attr_vals:row.attr_vals.join(' ')
				   })
				   if(res.meta.status!==200){
					   return this.$message.error('修改参数项是失败！')
				   }
				   this.$message.success('修改参数项成功！')
			},
			// 点击按钮，展示文本输入框
			showInput(row){
				row.inputVisible=true
				// 让文本框自动获的焦点
				//$nextTick 方法的作用：就是当页面上的元素被重新渲染后，才会指定回调函数中的代码
				  this.$nextTick(_ => {
				          this.$refs.saveTagInput.$refs.input.focus();
				        })
			},
			// 删除对应的参数可选项
			handleClose(i,row){
				row.attr_vals.splice(i,1)
				this.saveAttrVals(row)
			}
		},
		// 计算属性
		computed: {
			// 如果按钮需要被禁用，则返回true 否则返回false
			isBtnDisabled() {
				if (this.selectedCateKeys.length !== 3) {
					return true
				}
				return false
			},
			// 当前选中的三级分类的Id
			cateId() {
				if (this.selectedCateKeys.length === 3) {
					return this.selectedCateKeys[2]
				}
				return null
			},
			// 动态计算标题的文本
			titleText(){
				if(this.activeName==='many'){
					return '动态参数'
				}
				return '静态属性'
			}
		}
	}
</script>

<style lang="less" scoped="scoped">
	.cat_opt {
		margin: 15px 0;
	}
	.el-tag{
		margin: 10px;
	}
	.input-new-tag{
		width: 120px;
	}
</style>
